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CIVIL TECHNOLOGY
GRADE 10A
FOUNDATIONS
BY Mr TM Maluleke
Objectives
• To know the purpose of foundation
• To know the different types of foundations
• To know the material used for foundation
What is a foundation?
• A foundation is a lower
portion of building structure
that transfers its gravity
loads to the earth.
The purpose of foundations
• Distribution of total load coming from the strucure on a
larger area
• Stability against sliding & overturning
• Minimize differential settlement
• Provide level surface
• Minimise distress against soil movement
Factors affecting desgn of foundation
• Soil types and ground water table conditions
• Structural requirements and foundations
• Site condition and environmental factor
• Economy
Types of foundation
• Pad foundation
• Suitable for most subsoil except loose sand and gravels and fill areas
Strip fondation
• Suitable for most subsoil and loading
• Suitable for those encountered in low to medium rise
domestic dwelings where mass concrete can be used.
Raft foundation
• Used to spread the load of
the structure over a large
base to reduce the load
per unit area being
imposed on the ground
• Particularly useful where
low bearing capacity soils
are encontered and where
individuial column loads
are heavy
Pile Foundation
• Can be defined as a series of columns constructed or
inserted into the gound to transmit the loads of a structure
to a lower level of subsoil
• Can be used when suitable foundation conditiond are not
presented at or near ground level
Materials used for foundations
• Foundation must be constructed of a durable material of
an adequate strength
– Concrete
– Metal
– Aggregate
– Waterproofing materials
– wood
•Questions?
Class Activity
TYPE:
https://docs.google.com/forms/d/e/1FAIpQLScZXbQCBKzL
0SX3E0s6gf_vkmdftSLjInFT_A3kVE0KVGQ_QQ/viewform?
c=0&w=1
•Thank you!!

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